Tuning transformer



Oct. 23 1923,

J. F. RODGERS TUNING TRANSFORMER Filed May 26, 1922 wuentoz #757111, F Rodgers came/1 Patented Oct. 23, 1923.

UNITED STATES PATENT OFFICE.

JOHN F. RODGERS, 0F BROOKLYN, NEW YORK ASBIGNOB 0F ORE-HALF T0 0mm HANSELMANN, OF BROOKLYN, NEW YORK.

ruumo rmsronirsa Application med Kay 28, ms. Serial Io. 588,8:

To all whom it may concern Be it known that I, Jens 1 Bonuses, a citizen of the United States, and residing at Brooklyn in the county of Kings and State of New York, have invented certain new and useful Improvements in Tuning Trans formers, of which the following is a spccification such as will enable those skilled in the art to which it appertains to make and use the same. This invention relates to tuning transv formers for wireless receiving and transmitting apparatus of various kinds and classes; and the object of the invention is to rovide a transformer of the class described which is so constructed as to facilitate the tuning of a wireless apparatus to the finest degree in order to be able to pick up pre' determined broadcasting stations that may be within close range of each other without interference between the separate stations as well as to facilitate the sending of messages to predetermined points or stations;

or to predetermined receivin apparatus without interferenceor con iction with other r'eceiving apparatus; and with this and other objects in view the invention consists in a device of the class and for the purpose specified which is so constructed as to carry out the above objects in the same efiicient, practical and economical manner.

The invention is fully disclosed in the following specification, of which the accompanying drawin forms a part, in which the separate parts 0 my improvement are designated by suitable reference characters 1n each of the views, and in which:-

Fig. 1 is a plan view of my improved tuning transformer;

Fig. 2 a view looking at one end of the transformer with part of the construction broken away and iii-section; and,

Fig. 3 a diagrammatic view showing my improved transformer in circuit with a wireless receiver apparatus.

l'nFig. 3 of the drawing I have diagrammatically shown at 10 a wireless receiving apparatus comprising anaerial 11, a variable condenser 12, a condenser 13, phones 14 and other devices commonly employed in apparatus of this class and at 15,1 have dia grammatically illustrated my improved transformer comprising a primary coil 16, secondary coil 17 and supplemental primary coil 18 the coil 16 being provided with a 24, and

contact 19 movable thereover and which is connected with a. ground wire 20 as shown, While the secondar coil 17 is provided with a contact 21 movable thereover and a supplemental primary coil with a similar contact 22 movable thereover, said last named coil being in communication with the aerial.

In Fi 1 and 2 of the drawing I have shown t e transformer which isdiagrammatically illustrated in Fig. 3 made up in one form of device or unit comprising a suitable core 23 having end plates 24 and 25, and the rimary coil 16 is composed of comparative y heavy wire and is wound upon the core 23, as clearly shown in Figs. 1 and '2, and the secondary coil 17 is composed of comparatively fine wire and is woundupon the core 23 between the coils 16 and passes over a transverse insulated strip 26 mounted upon the core 23, after the coil 16 has been wound thereon, as clearly shown in 'Fi%h2 of the drawing.

The adjustable contact member 21 is similar in form and construction to the mem-. ber 19 and is mounted to slide upon another rod 29 directly over the strip 26 on the core 23, and this rod also extends throughthe end plate 24 and is provided with a. binding post 30. l

The coil 18 mounted between two parts 31 and 32 on the outer face of the end plate mounted in two binding posts 33 and 34 is a rod 35 which is located outwardly of the coil 18, and the adjustable contact member 22 in the form of a spring is mounted to slide on said rod, as clearly shown in the, drawing. Two other bindin posts 36 and 37 are connected with the end plate 24 to permit ofthe attachment of the usual circuit wires;

It will be understood that the wires from i the secondary coil and the adiustable contact thereof as diagranimatical y illustrated in Fig. 3, it being understood that the device or apparatus in the receiver or other wireless outfit are in circuit with the secondary coil of the transformer, while the aerial is in circuit with the primary coil and the supplemental primary coil.

It will also be understood that the wires of the coil 16 will be bare, or the iusula tion removed therelirom where the contact 15 moves thereot'er. and the wires of the coil 17 where the contact member 21 movcslhereover and over the insulation strip 26 will also be here. or the insulation of said wires removed at this point. but the separate coils 16 and 17 will be insulated from each other by the usual insulation on such wires.

It will be apparent that with the use of my improved transformer l eliminate tap ping or plugging into the primary coil and the secondary coil at predetermined points when wound on a suitable core or suitable cores which gives a Very limited range oi use of the apparatus. 'ith my construction I may tap onto each winding of the separate coils on the core and by using the supplemental primary coil 18. I may attain a finer adjustment by being able to tap onto the coil 16 through the coil 18 at practically any point along the entire winding of said coil on the core. the coil 19 being preferably of greater length than any one winding of the Wire of the coil 16 upon its core. 'ith an apparatus of this class and by the use of my improved transformer. an operator may place his apparatus in communication with a predetermined transmitting or sending station from which he may receive or to which he may deliver without interruptions or interference the desired messag selection or the like that may be sent out from a broad asting station. or which may be sent. out by him', or other parties or individuals.

It will also be understood that I am not necessarily limited to the form of the device shown in Figs. 1 and 2 of the drawing nor to the details of construction of the. device hown in said figures. nor to any specific use of my improved -apparatus, and various changes in and modifications of the construction herein shown and described may be made. within the scope of the appended claims. without departing from the spirit of my invention or sacrificing its advantages.

Having fully described my invention,

. what I claim as new and desire to secure by Letters Patent. is:--

1. A transformer of the. class described comprising a primary coil and a secondary coil. means adjustable over said coils and in circuit therewith for electrically placing said means in connection with the separate windings of said coils. said coils being wound on a common core with the turns of the separate coils located one between the,

other. and means for insulating said coils from each other, said last named means involving aninsulation strip mounted upon said core andupon the primary coil and over which the secondary coil is wound.

:2. A transformer oi the class described comprising a primary coil wound upon a suitable core piece. a secondary coil wound upon said core piece between the respective windings ot' the primary oil. means on said ore pieie for raising the windings ol' the secondary coil at a predetermined point and to insulate the secondary coil from the primary coil at this point. and contact. devices adjustable longitudinally of the core piece and one of which is adapted to engage the separate windings on the primary coil.

3. A transformer ol' the class described comprising a primary coil wound upon a suitable core piece. a secondary coil wound upon said core piece between the respective windings of the primary coil. means on said core piece for raising the windings of the secondary coi'l at a predetermined point and to insulate the sec ndary coil from the primary coil at this point. and coutaet'deriees adjustable longitudinally of the core. piece and one of which is adapted to engage the separate windings on the primary coil and the other of which is adapted to engage the separate windings of' the serondary coil.

4. A transformer ot' the class described. comprising a primary coil wound upon a suitable core piece. a secondary coil wound upon said core piece between the respective windings of the primary coil. means on said core piece for raising the windings of the secondary coil at a predetermined point and to insulate the secondary coil from the primary coil at this point. and contact devices adjustable longitudinally of the core piece and one of which is adapted to engage the separate windings on the primary coil and the other of which is adapted to engage the separate windings of the secondary coil, said contact devices being adapted to place the separate windings of said coils in electric circuit with predetermined apparatus.

5. A transformer of the class described 'comprisinga primary coil, a secondary coil,

and a suptdemental primary coil. electrical contact devices adjustable longitudinally of said coils and adapted to he placed in electrical commi'iuication with the separate windings of said coils. said primary coils and se ondary coil being wound. on a com mon core. and means for raising that por tion of the secondary coil over which the contact devices pass and for insulating said raised portion from the adjacent portion of the primary coil.

(3. A transformer of the t-l r s des ribed. comprising a suitable cure. it priority coil mounted on said core. a strip of insulating material mounted on said (tire and Plllltf],

coil alsecondary coil wound on said core and said strip, with the windin 3 thereof between the respective windings said rimary coil, and electric conducting mem ers adjustable longitudinally of the coils and tovided with spring contacts, one of which is adapted to en age the windings of the primary coil and t e other of which is adaptprimary coil and the other of which is adapted to engage the windings of the secondary coil where said strip of insulating. material is located on said core, saidcore being provided with end plates, and a supplemental primary coil mounted in connection with one of said end plates and in circuit with said primary coil.

8. A transformer of the class described, comprising. a suitable core, a primer coil mounted on said core, a strip of insulating 7 material mounted on said core and primary coil, a secondary coil wound on said core and said strip,'with the windings thereof between the respective windings of said primary coil, electric conducting members adjustable'longitudinally of the coils and prov c said end vided with spring contacts, one of which is adapted to engage the windings of the primary coil and the other of'which is adapts-l to engage the windings of the secondary coil where said strip of insulating material is located on said core, said core beingproided with end plates, a supplemental priary coil mounted in connection with one 1plates and in circuit with said primary coi, and an electric conducting member haying a spring contact adapted to Operate in connection with said supplemental' primary coil.

9. A transformer of the class described, comprising a; suitable core, a primary coil mounted on said core, a strip of insulating material mounted on said core and primary oil, a secondary coil wound on said core and said strip, with the windings thereof between the respective windings of said primary coil, electric conducting members adjustable longitudinally of the coils and rovided with spring contacts, one of whicli is adapted to-engagethe windings of the primary coil and the other .of which is adapted to engage the windings of the secondary coil where said stip of insulating material is located on said core, said core bein provided with end plates, a supplementa primary coil mounted in connection with one of said end platessand in circuit with said primary coil, an electric conducting member having a spring contact adapted to o crate in connection with said supplementa primar coil,

and means for placing said coils and e ectric conducting members in circuit with a predetermined apparatus.

10. A transformer of the class described comprising a primary coil, a secondary coil, and a supplemental primary'coil, electric contact devices "adjustable longitudinally of said coils andadapted to be placed in electrical comma ication with the separate windin s of sir (i coils, said rimar 'coil and g n P y secondary coil being composed of wires of different gage and being wound on a common core with the turns thereof located one between'the other. j 11. A transformer ofthe class described comprising a primary coil, a secorkdary coil, and a supplemental primary coi, e ectric contact devices adjustablelongitudinally of said coilsand adapted to be placed in electnical communication with the separatewindings of said coils, said primar coil and secondary coil being composed 0 wires of different gage and being wound on a common corewiththe turns thereof located one between the other, and a body of insulating material extending longitudinally ofand adapted to separate predetermined portions of the primary and secondary coils.

12. A transformer of the class described comprising a primary coil and asecondary coil, means adjustable over said coils and in circuit therewith for electrically placing said means in connection with the separate .windings of said coils, said coils being wound on a common core with the turns thereof located one between the other, and means on said core and primary coils for insulating that portion of the secondary coil. over which the first named means passes, from the primary coil.

13. A transformer of the class described comprising a core provided at its ends with plates, primary and secondary coilswound on said core with the turns thereof one between the other, means for raising a predetermined portion of the secondary coil for insulating the same from the primary coil, means joining said end plates and extending longitudinally of the core for supporting movable contact devices thereon, one of said contact devices being movable over the raised portion of the secondary coil and adapted to contact with the separate windings thereof, and the other of said contact devices being movable over and adapted to contact with the separate windings of the primary coil.

14. A transformer of the class described comprising a core provided at its ends with plates, primary and secondary coils wound on said core with the turns thereof one between the other. means for raising a predetermined portion of the secondary coil for insulating the same from the primary coil, means joining said end plates and extending longitudinally of the core for supporting movable contact devices thereon, one of said contact devices being movable over the raised portion ofthe secondary coil and adapted to contact with the separate windings thereof, the other of said contactdevices being movable over 'and adapted to contact with the separate windings of the primary coil, and asupplemental primary coil mounted in connection with one of said end plates.

15. A transformer of the class described comprising a core provided at its ends with .insulating the same from the primary coil, means-joining said end plates and extend ing longitudinally of the core for supporting movable contact devices thereon, one of said contact devices being movable over the raised portion of the secondary coil and adapted to contact with the separate windings thereof, the other of said contact devices being movable over and adapted to 'contact with the separate windings of the primary coil, a supplemental primary coil mounted in connection with one of said end plates, and a contact device movable relatively to said last named coil and adapted to contact With the separa.te windingsthereof.

16. A transformer of the class described comprising a primary coil wound on a suit-- comprising a primary coil wound on a suit-- able core-piece, a secondary coil wound upon said core-piece between the windings of the.

primary coil, and means for.raising a predetermined portion'of the windings of the secondary coil and to insulate the secondary coil from the r-imary coil.

18. A trans ormer of the class described comprising a primary coil wound on a suitable core-pieoe, a secondary coil wound upon said core-piece between the windings of the primary coil, means for raising a prede termined portion of the windings of the secondary coil and to insulate' the secondary coil from the primary coil, and contact devices adjustable relatively to and adapted to contact with the separate coils.

19. A transformer of the class described comprising a primary coil Wound on'a suitable complete. a secondary coil wound upon said core-piece between the windingsof the primary coil, means for raising a predetcrmined portion of the windings of the secondary coil and to insulate the secondary coil from the primary coil, contact devices adjustable relatively to and adapted to contact with the separate coils, and one of said contact devices cooperating with the raised and insulated arca'ol the sc 'ondary coil.

In testimony that I'claim the foregoing as my invention I have signed my name this 25th day of May, 1922.

- JOHN F. R DGERS. 

